Controlling device.



A. HOESCH.

CONTROLLING DEVICE.

APPLICATION FILED FEB.24.1917.

Patented Sept. 10, 1918,

wel.

Mammut 2-2 of Fig. 1; Fig. s

UNITED STATES PATENT oFFroE.

ALFRED ROESCH,- 0F BROOKLYN, NEW YORK, ASSIGNOR TO CHARLES J. TAGLIABUEMANUFACTURING CO., OF BROOKLYN, NEW YORK, A CORPORATION 0F NEW YORK.

CON TROLLIN G DEVICE.

Specication of Letters Patent.

Patented sepa-1o, 1918.

Application tiled February 24, 1917. Serial N o. 150,743.

automatically control temperature, pressure and the like and has for itsobj ect to provide such adjusted to produce the desired result andwhereby the adjustment and `its results are visibly indicated. Otherobjects of my'improvement will appear from the description hereinafterandthe features of novelty will be pointed out in the appended claims.

In the accompanying drawings I have shown my improvement operativelycombined with an automatic temperature controlling device, it beingunderstood that this is merely an example selected for illustrative anddescriptive purposes. In said drawings Figure 1 is an elevation partlyin section; Fig. 2 is a detail section on the line is a horizontalsection on the line 3-3 of Fig. 1 and Fig. 4 is a detail elevation ofanother form of my improvement.

Referring to the drawings 5 represents a valve casing or bonnet dividedinteriorly into an inlet chamber 6 and an outlet chamber 7, the formerbeing connected, for instance, by means of a pipe 8 with a source of amedium for producing temperature variations while the lattercommunicates with a pipe 9 leading temperature is to be regulated. Thechambersl 6 and 7 are connected with eachother by means of passages 10controlled, for instance, by a double valve 11 of any well known typeand carried by a stem 12 which extends through and is slidable in thecus-l tomary stufling box or the like 13.

The stem 12 in the illustrated example is` screw-threaded at its outerend for detachable connection with the internally screwthreaded end of arod 14, a look nut 15 being provided for preventingunintentionaldisconnection of these elements. At its upper end the rod14 is connected with the closed end plate 16 of an expansible hollowapparatus with a simple and efficient adjusting means whereby it may bereadilyV to any pointat which the Wise of each other,

member or bellows 17 which is carried by a frame 18 of suitableconstruction, the latter in the illust-rated example being securedy uponthe stuffing box 13 of the valve casing 5. The stuiiing box 13 which isexternally screw -threaded accommodates a nut 19 whereby said frame 18is secured in an upright position above the valve casing 5 as shown inFig. 1 of the drawings. The interior of the member or bellows 17 isconnected, for instance, by means ofa ilexible tube 20 with a bulb 21containing a volatile y fluid` arranged to expand and contract under theinfluence of temperature variations, said bulb point trolled and so asto be subjected to the in- 21 in practice being located at the at whichthe temperature is to be conliuence of the temperature at this point.

The expansion and contraction of the volatile uid ,operates the memberor bellows 17 in the usual way as will be more fully explainedhereinafter.

Any suitable means may be included in the apparatus for resisting theexpansion of the member or bellows 17 under the influence of saidvolatile fluid, the illustrated example showing a coil spring 22 forthis purpose.

The latter surrounds the rod 14 'and has its one end in engagement withthe end pl ate`16 of the bellows 17 and its other end resting upon awasher 23 provided with an upright annular flange 24 extending withinsaid spring 22 and whereby the latter is maintained against anytransverse displacement relatively to said washer 28. The

`latter is loosely mounted upon the reduced end 25 of an externallyscrew-threaded sleeve 26 and rests upon an annular shoulder 27 thereofas shown in Fig. 2, said sleeve 26 in the illustrated example having itsone end provided with an vintegral angular head or nut 28. The saidsleeve 26 passes through and is in screw-threadedengagement with across-bar 29 forming part of or secured to the frame 18 and looselysurrounds the rod 14 so that both the sleeve and the rod are capable ofa relative movement lengthand the sleeve is rotatable about said rod,the purpose of which will appear more fully hereinafter. At a pointabove the cross-bar 29 and preferably somewhat below the annularshoulder 27 the sleeve 26 carries a disk 30 which is fixed upon or formsan integral part thereof, the periphery of said disk 30 extending intoclose proximity to an upright plate 31 carried by an upright support 32which forms part of or is secured to said'cross-bar 29 in any suitablemanner as by means of screws 33. In the preferred arrangement the plate31 is provided with slots 34 for the accommodation of screws 35 wherebysaidplate is adjustably mounted upon the support 32. The periphery ofthe disk 30 and the plate 31 are provided with coperating designations36 and 37 respectively of any suitable character, the designations inthe illustrated example shown in Fig. 1 representing tenths, it beingunderstood that the designations 36 are readable in connection with theleft hand edge of the Lplate 31 while the designations 37 are readablein connection with the upper edgeof the disk 30 in the illustratedexample. In other words the disk 30 and plate 31 may be said to comprisea vernier scale of which the disk 30 1s vernier and the plate 31 is thescale plate, the designations 36 and 37 being readable in combinationand in the illustrated .ex-

ample reading hundreths.

In the operation of the device as illustrated the volatile tluid in thebulb 2 1 as 1t expands under the influence of a rise 1n temperaturecauses the bellows 17 to expand in the customary manner. As the bellows17 1s held against expansion in one direction by the one end of theframe 18, this expansive movement can only take place against thetension of the spring 22 and when it occurs serves to move the valve 11through the medium of the rod 12 in' a direction tending to close thesame. As soon as the volatile fluid in the bulb 21 contracts under theiniuence of a dropy in temperature the spring 22 serves to actuate-thebellows 17 in a collapsing direction whereby the valve 11l through themedium of the rod 12 is Amoved in a direction away from 'its seat orseats.- Thus as the temperature at the bulb 21rises the valve 11'isactuated to decrease or cut od the supply of heatin medium from the pipe8 to the pipe'9 an as the temperature at said bulb drops the valve 11 isopened to either renew or increase the supply ofl yheating medium fromthe pipe 8 to the pipe 9, the valve 11 being alwaysautomaticallyoperated to'maintain the temperature at the bulb 21 at a substantiallyconstant point.'

The operationlso far described may be said to be common to many forms ofautomatic controlling' devices; it Lwill be seen in the present casethat the spring`22 is the factor which determines the actuationof-thepbellows 17. From this it follows that .by-adjusting the tensionof the spring 22 the ap-` paratus may be caused tosubstantially-'maintain the temperature at a given point atany c.desired degree.` This is accomplished inthe present case by rotatingthedisk 30 which brings about a rotation of the sleeve 26 which, owingtoV its screw-threaded connection with the cross-bar 29, travels in thedirection of its length relatively thereto, in one direction or anotherthis depending on the direction of rotation. The rotation of thesleeve.26 may be accomplished through the medium of the nut 28 or in anyother convenient way.L The described actuation of the sleeve 26 isrelatively to the washer 23 and lengthwise of as well as rotatablyrtbout the rod 12 and either increases or decreases the tension of thespring 22 according ,to the direction in which the disk 30 is actuatedas will be readily apparent.

During the adjustment above described the periphery of the disks 30moves in close proximity to the plate 31 and at the same time the disk30 moves lengthwise of said plate; thus it may readily be determinedwhat extent of operation of the disk 30 is required to produce thedegreeof tension in the spring 22 necessary to bring about the desiredtemperature control. In other words the various readings of thecoperating designations 36 and 37 correspond accurately to certaindegrees of temperatures, so that it is onl necessary to determine bycalculation or y actual tests just what those temperatures are in orderto be vable to accu-l sponds to this degree of temperature. Af-A terthis has -been determined the operator need only actuate the disk 30-until the Cooperating designations 36 and 37 read fiftysix hundredthseach time a tem erature con-u trol at 260 F'. is desired. It wi l thusbe ap-y parent that an desired result may be accurately and e cientlypredetermined in a simple manner by simply actuating the disk 30relatively to the scale plate 31- to the de'- sired extent,- thus doingaway 'with guess work and careful manipulation heretofore necessary andat best producing only unsatisfactory results. Thel adjustment of thepresent device may be changed as frequently as desiredand may always bereturned to a given and 'many adjustments and makes it possible int 'prto any desired point without any di culty; The device is capable ofminute to secure small accurate variations with no more trouble thanisordinarily required to.

make coarser changes. l p .In the form shown in Fig. 4 the disk 130corresponding tothe. dlsk 30 1s provided with a peripheral orcircumferential edge 136 which coperates with the designations 137 onthe scale plate 131.which corresponds 'to the scale plate 31. `Thedesignations 137 represent degrees of temperature and in cooperationwith the edge 136 of said disk 130 indicate the adjustment of the deviceor the degreeV of temperature which will be automatically maintainedthereby at the bulb 21.`

This form of my improvement may other'- wise be the same as the formfirst described and includes the saine advantages as to operation andeiciency.

-While I have described my improvement 1n connection with a temperaturecontrolling .Y device it istobe understood that this is not arbitrary,the arrangement being equally useful and efficient in connection withdevices for automatically controlling` pressure and other mediums. u v

y improvementin all o' its forms is extremely simple in construction andoperation, is not likely to become disarranged, requires noskilledattention either to operate or in the care thereof and makes `itpossible to secure accurate and fine adjustment I with a minimum ofeffort.

Various changes in the 'specific :formsy shown and describedmay be madewithin the scope of the lclaims'without departingY from the spiritof/m'y invention.'y

I claim: i 1. In a controllin device, a controlling valve, a framecarrled thereby, a bellows carried by said frame, a connection betweensaid bellows and valve, means for operating said bellows in onedirection to actuate said valve, a spring for resisting said operationof said bellows and for actuatingit and said valve in a returndirection, a stationary scalev plate provided with designations 'gasleeve vin screw-threaded engagement withsaid frame Y of said foradjusting the tension of said spring, a i

disk carried by said sleeve and rotatable therewith adjacent tosaid/scale plate and means on said disk coperatng with the designationson said scale plate to indicate said adjustment.

2. In a controlling device, a controlling valve, al frame carriedthereby, a bellows carried by said frame, a connection between saidbellows and valve, means for, operating said bellows in one direction toactuate said valve, a spring for resisting said operation bellows andfor actuatingit and said valve in a return direction, scale, plate.provided with designations, a sleeve in screw-threaded engagement withsaid frame for adjusting the tension of said spring, a disk carried bysaid sleeve and rotatable therewith adjacent 'to said scale plate,"anddesignations on the periphery of said disk cooperating with thedesignations f on said scale plate to vindicate said adjust- 3.k In acontrolling device, a controlling valve, a frame carried thereby,

a bellowsl d carried by said fram`e,a connectionl between said bellowsand valve, means for operating y.said'bellows inone direction to actuatesaid .indicate said adjustment. Y

In testimony whereof I have .hereunto set myhand.-

r 'i l ALFRED ROESCH.

